解析格式地图＆LT的JSON;弦乐，ArrayList的＆LT;串GT;＆GT;在android系统 [英] Parsing JSON of format Map<String, ArrayList<String>> in android

问题描述

我有JSON对象：

{1：[1，的test.txt，authortest，sizetest]，2：[2，GraphTheory.pdf，测试，0 ]}

{"1":["1","test.txt","authortest","sizetest"],"2":["2","GraphTheory.pdf","testing","0"]}

有地图>列表地图;

现在我需要解析它在这里：

Now I need to parse it in here :

给出答案解析像这样做：

As of given answer parsing is done like this :

  protected Map<String,ArrayList<String>> doInBackground(
            String... arg0) {
        JSONParser jParser = new JSONParser();
        String json = jParser.getJSONFromUrl(url);
        Gson gson = new Gson();
        Type type = new TypeToken<Map<String, List<String>>>() {}.getType();
        Map<String,ArrayList<String>> allBookList = gson.fromJson(json, type);
        return allBookList;
}

下面每个映射包含三个项目的ArrayList：BOOKNAME，BOOKAUTHOR和书本

Here each Mapping contains an arraylist with three items : BOOKNAME,BOOKAUTHOR and BOOKSIZE.

@Override
    protected void onPostExecute(Map<String, ArrayList<String>> result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        ListAdapter adapter = new SimpleAdapter(
                ViewLibrary.this, result,
                R.layout.book_item, new String[] { BOOKNAME,
                        BOOKAUTHOR,BOOKSIZE }, new int[] { R.id.bookname,
                        R.id.bookauthor, R.id.booksize });

        lv.setAdapter(adapter);
    }

现在我需要在一个listview.How显示它做到这一点？
我觉得适配器需要在onPostExecute method.But设置，我无法理解它从哪里得到这三个how.As：BOOKNAME，
                            BOOKAUTHOR，书本型

Now i need to display it in a listview.How to do this ? I think adapter need to be set in onPostExecute method.But I am not able to understand it how.As from where to get these three : BOOKNAME, BOOKAUTHOR,BOOKSIZE

推荐答案

由于您是新的JSON，你可能需要使用GSON库。要做到这一点在的build.gradle和同步添加上你的依赖

As you are new to JSON you may want to use GSON library. TO do that add to yuor dependencies in build.gradle and sync

compile 'com.google.code.gson:gson:2.3'

假设 JSON 包含您的JSON字符串你可以使用这样的：

Supposing json contains your JSON string you can use it like this:

import java.lang.reflect.Type;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

// (...)

Gson gson = new Gson();
Type type = new TypeToken<Map<String, List<String>>>() {}.getType();
Map<String, List<String>> map = gson.fromJson(json, type);

这篇关于解析格式地图＆LT的JSON;弦乐，ArrayList的＆LT;串GT;＆GT;在android系统的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！